GPIO Expander ICs - BU1852GXW

Keyencoder IC BU1852 can monitor up to 8x12 matrix (96 keys), which means to be adaptable to Qwerty keyboard. Weadopt the architecture that the information of the only key which status is changed, like push or release, is encoded into the8 bits data. This can greatly reduce the CPU load which tends to become heavier as the number of keys increase.(Previously, all key's status is stored in the registers.) When the number of keys is small, the extra ports can be used asGPIO. Furthermore, auto sleep function contributes to low power consumption, when no keys are pressed. It is alsoequipped with the various functions such as ghost key rejection, N-key Rollover, Built-in power on reset and oscillator.